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Shareholders' Equity and Long-Term Incentive Compensation - Common Stock and Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of common shares issued, treasury shares and shares outstanding |  |  |
Balance at the beginning of the period (in shares) | 42,650,599 | 41,940,000 | 41,416,000
Restricted stock shares and restricted stock units (in shares) | 457,000 | 280,000 | 337,000
Retirement of treasury stock (in shares) |  |  | 0
Other (in shares) | 343,000 | 431,000 | 187,000
Balance at the end of the period (in shares) | 43,450,305 | 42,650,599 | 41,940,000
Amount of retirement of treasury stock |  |  | $ 0.0
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Authorized shares (in shares) | 200,000,000.0 |  |
Par value (in dollars per share) | $ 0.01 |  |
Summary of common shares issued, treasury shares and shares outstanding |  |  |
Balance at the beginning of the period (in shares) | 51,186,000 | 50,755,000 | 100,526,000
Restricted stock shares and restricted stock units (in shares) | 0 | 0 | 42,000
Retirement of treasury stock (in shares) |  |  | (50,000,000)
Other (in shares) | 343,000 | 431,000 | 187,000
Balance at the end of the period (in shares) | 51,529,000 | 51,186,000 | 50,755,000
Amount of retirement of treasury stock |  |  | $ 0.5
Common Stock In Treasury |  |  |
Summary of common shares issued, treasury shares and shares outstanding |  |  |
Balance at the beginning of the period (in shares) | (8,535,000) | (8,815,000) | (59,110,000)
Restricted stock shares and restricted stock units (in shares) | 457,000 | 280,000 | 295,000
Retirement of treasury stock (in shares) |  |  | 50,000,000
Other (in shares) | 0 | 0 | 0
Balance at the end of the period (in shares) | (8,078,000) | (8,535,000) | (8,815,000)
Amount of retirement of treasury stock |  |  | $ (2,948.1)
Paid-In Capital |  |  |
Summary of common shares issued, treasury shares and shares outstanding |  |  |
Amount of retirement of treasury stock |  |  | 1,285.4
Retained Earnings (Deficit) |  |  |
Summary of common shares issued, treasury shares and shares outstanding |  |  |
Amount of retirement of treasury stock |  |  | $ 1,662.2

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